Valve



FIG. 1 is a front view of a valve showing our new design;

FIG. 2 is a plan view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a cross section taken along the A—A line in FIG. 3 thereof; and,

FIG. 6 is a perspective view thereof.

The broken line showing of environment is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a valve, as shown and described. 